lol for those that think tanking sucks... think about it.
Get 70 str, and 60 ranged, and stay with 20 def... when ur a memb wear full initiate armour(or that other 30 def prayer armour lol)(prosylet its called) and wear red dhide chaps. use dbow when ur not mauling. use crossbow with either emerald bolts(for -8 poison) or ruby bolts. Magic bow with rune arrws, while using rapid. But if you are really loaded with cash, then use rune, dragon, or even addy knives (or darts if u want extreme speed, but dont hit as hard). soo yeaa lol.
The tank has a highe success rate of hitting, while the pure has less chance with a tanker (especially like a 40 def 40 ranged tanker like mine

)
In this new pvp, since most people are going in 1v1 zone(single combat), the def will matter, unlike the old wildy, where you could bunch up on a lvl 70 def person and all hit high hits until hes dead. 1v1 means no teeming up on others.
The ranged tanks will also survive more in the wildy, while other noob pures run from them (they run frm me all the time). This means improved chance of getting better loot.
So in conclusion
1 def=fail
in pvp wrld lol. or unless your a high lvled mager, but even then, 20 def for mystic will get u k0s

hope i helped.